This report is the fourth and final report in a series that explores the cross-payer effects of providing Medicaid long-term supports and services (LTSS) on Medicare acute care resource use. The report provides a summary of the initial work of a study, described more fully in the first three reports, with an emphasis on lessons that state Medicaid administrators should consider as they move toward more formal programs of integrated care for persons dually eligible for Medicare and Medicaid (or duals, for short).